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BS ISO 4701:2017

$189.07

Iron ores and direct reduced iron. Determination of size distribution by sieving

Published By Publication Date Number of Pages
BSI 2017 46
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PDF Catalog

PDF Pages PDF Title
2 National foreword
7 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Principles and planning
4.1 General
4.2 Purpose of the analysis
4.3 Impact of ore and DRI properties
4.3.1 Effect of moisture content
11 4.3.2 Degradation of material
4.3.3 Magnetic ores
12 4.4 Nature of sample
4.5 Choice of sieving method
4.6 Maximum particle size permitted on a sieve
13 4.7 Specified loading of sieves
4.7.1 General
4.7.2 Batch sieving with a single sieve or nest of sieves
14 4.7.3 Loading of continuous sieving machines
4.8 Sieving time
4.8.1 General
4.8.2 End point ruling
4.8.3 Retention time for continuous sieving machines
15 5 Apparatus
5.1 Sieve media
5.1.1 Shape of aperture
5.1.2 Size of aperture
5.1.3 Construction of sieve media
5.1.4 Sieve frames for hand or mechanical nest sieving
5.2 Sieving machines
5.3 Accessories for wet sieving
16 5.4 Drying equipment
17 5.5 Equipment for the determination of mass
6 Samples
6.1 Derivation of size sample
6.2 Mass of test sample(s) for sieving
6.2.1 General
6.2.2 Minimum mass
18 7 Procedures
7.1 Drying
7.2 Division
19 7.3 Preparation and maintenance of sieves for test or nest sieving
7.4 Sieving
7.4.1 General
7.4.2 Hand placing on individual sieves
7.4.3 Hand sieving in the −40 mm to +1 mm range
20 7.4.4 Hand sieving in the −1 mm range
21 7.4.5 Mechanical batch sieving
7.4.6 Wet sieving of coarse and fine samples
22 7.4.7 Continuous machine sieving
7.5 Determination of mass
7.5.1 General
23 7.5.2 Wet sieving — Determination of mass of solids-content in washings
7.6 Determination of sieving end point
7.6.1 Dry sieving
24 7.6.2 Wet sieving
8 Verification
8.1 General
8.2 Checking of division
8.3 Verification of sieve media
8.4 Verification of sieving machines
8.5 Verification of weighing devices
9 Results
9.1 Evaluation of results
25 9.2 Calculation and expression of results
26 9.3 Repeatability and acceptance of results
27 10 Test report and working log
11 Precision
11.1 Overall precision, βSPM
11.2 Precision of preparation and measurement, βPM
29 Annex A (informative) Steps for establishing operating conditions
30 Annex B (normative) Scheme of sample preparation and sieving procedure
31 Annex C (normative) Maximum mass to be retained at completion of batch sieving
33 Annex D (informative) Size apertures in R20 and R40/3 series
34 Annex E (informative) Typical batch sieving apparatus
35 Annex F (informative) Desirable features of mechanical sieving machines
38 Annex G (normative) Procedure for determining the minimum mass of sample used for sieving
41 Annex H (normative) Flowsheet of the procedure for the acceptance of analytical values for test portions
42 Annex I (informative) Additional information
44 Annex J (normative) Determination of the average particle size (APS)
45 Bibliography
BS ISO 4701:2017
$189.07